System of electrical distribution.



J. L. WOODBRIDGB. SYSTEM 0E ELECTRICAL DISTRIBUTION.

' APPLIGATION FILED MAVY 18, 1908 Patented Nov. 30,1909.

W/ T/VESSES:

AQ/d

Jessen :susanna woonnninen, or rninannnrniii; rnnai'srnviatrn.

SYSTEM l? ELECTRICAL DISTRBUTIGN.

senseo.

To all'wiom 'ii may concern;

Be it known that l, JOSEPH Lns'rnn 1Woon- Biiinen, a citizen of the United States, and a resident of Philadelphia, in the county of `.-.Dhiladelphia and State of Pennsylvania,

have invented a certain new and useful Systern of Electrical Distribution, of which the following is a specification.

My invention relates to systems of distribution .in which a source of alternating eurrent is supplying alternating enrrent translating devices and also through suitable transforming apparatus direct current translating devices, and it is particularly applicable to systems in which a synchronous converter of the type described in my applications Nos. 411,570 and 416,270 is used in conjunctionA with a storage batteryffor controlling the fluctuations of load.

The' synchronous converter referred to above is designed to give a variable direct current voltage to cause the battery to charge and discharge, at the same time maintaining a constant alternating current voltage.

, .Such a system is particularly useful 'where the load consists of alternating current translating devices only and there is no ,rect current direct current load requiring a constant di- LJcltage.. 1f, however, direct current transla ing devices are also to be su plied requir ng a constant direct current voltage Sonie other arrangement must be ein loyedi' l ne of the ob'eets of iny present inven` tion is to provi e a synchronous converter designed to develop a constant direct current voltage across one set of brushes for the direct current translating devices and also a variable direct current voltage across another set of brushes which are connected to the regulating storage battery, the alternating current voltage being maintained `cnstant for connection to a constant poten- 'tial alternating current circuit.

Vconverter. is provided with two principal Specification of Letters latent.

Application. tiled May 18, 1912's.

Nein dit?, iltiQ-l.,

serial no. eases?.

poles P1 and P2 and two 'auxiliary poles ll3 and Pt, the latter poles being displaced 90 troni the former in order to provide 'for a variable direct current voltage with the least possible change in the alternating current Voltage. rllie principal poles 1 and?2 are excited by a winding 11 connected across the direct current circuit 4 5 thus providing a constant excitation for these poles. The auXiliary poles P3 and l, are excited by a winding 10, the cui-rent in which is controlled by the carbon regulator C, this eurrent varying in amount and direction with the load on the source A. The armature l) is connected by suitable collector rings and conductors to the three phase circuit il, 2, and 3, in the usual manner. lt is also provided with a coininutator E on which bear three brushes 12, 13 and 14.

The armature winding and comniutator connections are so designed that the arinature conductors passing under poles l and P3 are in series between brushes 12 and 13. Thus the potential between the brushes i2 and 13 is determined by the total flux in the main and auxiliary poles, and will there- -fore vary with the varying excitation ot the auxiliary poles l and l. l'ilhe storage buttery B is connected across these brushes and is therefore caused to charge and discharge by reason of the varying potential. 'lhe `brush lll is vso located that one ci' the :irmatnre circuits between brushes 12- and 1i includes only those conductors which are pussving under poles P1 and l", und therefore the potential between the brushes 12 and 14 is controlled by the [lux in the principal poles I" and PL only, that is`r brush 14 makes contact with the couunutntor at a point connected to the urinuture winding between l. and P3. Since the excitation of the principal poles is practically constant the potential across the brushes l2 and' li will there- 'forc be maintained constant irrespective of of the battery by moans of Ythe conductors 7 'and 8. The `field winding 10 ot the auxiliary poles et the converter is connected between a peint in the circuit between the two vcarbon piles and the middle point. et the battery and the current in this Winding 10 will vary therefore in amount and direction with slight changes prt ue on the carbon piles produced by slight variations of load on the source A, thus varying the direct current voltage between the brushes l2 and 13, thereby causimf the battery to charge and discharge in response to the small fluctuations'oi load on the source A. LrThis ettect will be produced whether the fluctuations oit load originate on the alternating current circuit as at L or on the direct current circuit as at L". The converter t as thus designed therefore provides means 'for maintaining r a constant voltage on the direct current. consumption circuit. and at the saine time produces a variable voltage across the battery to compel it. to charge and discharge in response to lluetuations of load on either circuitit Will be understood that modifications may be .made in the detailswithout departing from the spirit of the invention, and l 'do not therefore limit myself except as the prior art may require, but

- Having; thus described my invention what claim is:

i.. in coinl'iination an armature provided 'with alternating current terminals and a eonin'iutator, a iield frame :tor the armature provided with principal and auxiliary poles,

means for applying' a constant excitation to the principal poles, `means for applying a variable excitation to the auxiliary poles, and brushes bearing;V on the commutator whereof some make' Contact at points whose potential difference is determined by the flux inthe principal poles, while others make contact at points Whose potential difference is determined by the total tiux in both the principal and the auxiliary poles.

2. An alternating current circuit and its source, a direct current circuit, a storage battery, an armature operatively connected tol the alternating current' circuit, a iield frame for the armature provided with principal and auxiliary poles, means for applying a constant excitation to the principal poles, means responsive to the electrical condition of the alternating current circuit for applying a variable excitation to the auxiliary poles, brushes bearingon the commutator, whereof some make contact at points whose potential difference is determined by the iux in the principal poles and are connected to the direct current circuit, while others make contact at points Whose potential diiterence is determined by the total flux in both the principal and the auxiliary poles and are connected to the storage battery.

ln testimony whereof I have hereunto signed my name.

JOSEPH ALESTER WOODBRDGE. Witnesses lit. J. JAcnsoN, FRANK E. FRENCH. 

